The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 24, 2006
Filed:
Jul. 20, 2004
Masahiro Koyama, Tokyo, JP;
Seizo Inoue, Tokyo, JP;
Yusaku Sakai, Tokyo, JP;
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Abstract
Each of impeller grooves of an impeller has a first bow surface that extends from one end surface of the impeller so as to have a radius R, a second bow surface that extends from the other end surface of the impeller so as to have a radius r, and a projected partition wall having a connecting surface that connects the first and second bow surfaces. A pump cover and a pump base are provided adjacent to the respective end surfaces of the impeller, and are formed with respective annular feed passages that are defined by semicircular wall surfaces having radii Rand r, respectively. The radii Rand rof the first and second bow surfaces are set longer than the radii Rand rof the semicircular wall surfaces, respectively.